Bit brace



Jan. 24, 1928. 1,656,967

J. M. WELCH BIT BRACE Filed July 17, 1923 2 Sheets-Sheet 1 Ir/M55555 W5)AZ WHM Jan. 24, 1928. 1,656,967

J. M. WELCH v BIT BRACE Filed July 17. 1923 2 Sheets-Sheet 2 &w////////////////l'w////))/;

li atented Jan. .122 9 1928.

JAMES m. wnnon, or VICKSBURG, rarssrssrrrr. j

PATENT OFFICE.

BIT IBBAGE.

Application filed July 17, 1923-. Serial No. 652,147.

The present invention relates to hit braces and has for its principalobject to provide a brace of this nature which is extensible so that agreater leverage may be obtained Ill when needed.

Another important object of the invention is to provide an extensiblebrace of the type described which possesses a simple and ellicientconstruction, one which is reliable in operation, comparativelyinexpensive to manufacture, durable, and well adapted to the purpose forwhich it is designed.

With the above and numerous other objects in view as will appear as thedescription progresses, the invention resides in certain novel featuresof construction, and in the combination and arrangement of parts as willbe hereinafter more fully described and claimed.

in the drawing Figure 1 is a perspective view of the bit brace embodyingmy invention,

Figure 2 is a fragmentary elevation of a portion thereof showing thesame extended partially,

Figure 8 is a longitudinal section through one leg of the body portionof the brace,

Figure 4 is a similar view showing the parts extended, and

Figure 5 is a transverse section taken substantially on the line 55 ofFigure 3.

Referring to the drawing in detail it will be seen that the body 1 is ofthe usual U shaped structure including the intermediate portion 2 andthe legs 3. Que leg 3 has its end extended at right anglesas at 4 forthe reception of a swivelly mounted knob 5. The end of the other leg 3receives the pawl and ratchet mechanism 6 which is connected with thedisengaging member 7. The interintermediate or second section 11 whichis in the form of a tube having an internal longitudinally extendinggroove 12. Apertures 13 are provided in the second section 11 at eachend of the groove 12. A spherical member 14 is disposed in an orificeprovided in the head 10 and a spring 15 is tensioned' to push thisspherical member outwardly so as to engage in the groove and theaperture. This spherical member prevents the intermediate or secondsection 11 rotating in relation to section 9 but allows the same toslide in relation to each other. A plug 17 is threaded into each end ofthe second section 11 and one of them is provided with an orificecontaining a spherical member 18 and a spring 19. This plug having theorifice is constructed with an enlarged head slidable in the third orouter section 20 which is provided with a longitudinally extendinggroove and apertures 22 one at each end of the groove. This groove 21and apertures 22 are adapted to receive the spherical member 18' thuspreventing the outer section from rotating in relation to theintermediate section 12. These sections 12 and 20 are of similarconstruction. A plug 24 is disposed in one end of the section 20 and isadapted to abut the head of the plug 17 A plug 25 is threadedly engagedwith the other end of the outer section 20 and is connected with theremaining portion of the leg 3.

The apertures and grooves mentioned are also useful in feeding oil tothe extendible feature of the device. It is thought that theconstruction and operation of the invention will now be readilyunderstood without a more detail description thereof. In the presentinstance, I have shown and described only the preferred embodiment ofthe brace which will give in practice satisfactory and reliable results,and it is to be understood that the same is susceptiblev of modificationin various particulars without departing from the spirit or scope of theinvention or sacrificing any of its advantages.

Having thus described my invention, what I claim as new and desire tosecure by Letters Patent, is: 1

An extensible bit brace arm comprising an outer tubular section having alongitudinally extending groove and further provided with apertures atthe ends of the groove, 8.

plug in one end of the section, a second plug in the other end of thesection having an opening therein, a smaller tubular section insertedthrough said last named plug and received Within the outer section, aplug carried by the inner end of the inner section, and means carried bythe last named plug and slidahly received within thesaid groove wherebyto prevent the rotation of the inner section relative to the outer seo-10 tion, said means adapted to he received within the said aperture tolock the arm either in extensible or collapsed position.

In testimony whereof I aflix my signature.

JAMES M. WELGH.

